Winch



G. T. MACFARLANE.

WINCH.

APPLICAUON FILED MAR. 25. 1918.

l ,345, l 3 l Patented July 6 19240.,

UNITEDSTAT- i suenen "rrroiriiis ianeraiiiinivn on Pinnen,

brakes that arefitted `withbrake blocks or "with a bearing surface ofcompressed liber To all fwwmz't may concern r1 i 1 avoided.

treads Be it known that 1,1Gnoiienllnoivras Mae-` raiiiiann, a `subjectof thelKingfof Great Britain-and Ireland,`residing atl?inner, in

the county of Middlesex,` England, have iii-1 vented lmprovements" inWinches, offwhich the following'` is a specification. i

Thisinvention relates to `wiiiches such as illustrated `and described ininy` application `Serial No. 170,123, iiiled May 22,1917, of`

y which" this application is a division, and has `for its object toprovide a winch particularly l suitablelfor use asa ship"s"winch forhan` dlingl cargo quickly* and without undue shock, iioverhauling? ofthe `winch IbairelI being effected rapidly and detrinieiitalheatu ingand wear of the brake `devices being In awiiichaccording to theinvention, the

barrel, or each barrehis rotated freni the driving shaft l through@epicyclic "gear conti'olled by brake drums furnished with band or othersuitable material. "Means iarepro vided `as by fixed studs or `thelikearraiiged around andat a suitable distance fronifthe periphery ofthe brake jband 1 to prevent l oi `rniiiirni'fie contacti between thebrake "bands ships cargotends to ,produce detrimental lieatingand wearof the brake devices` asis well known and in order@` to Jobvi ate thisdis# i advantage and consequently to increase the `life "and -eiiiciencyofthe winohthe" brake drums thereof are cooled by currents of ai-rfproduced by the provision of inclined vanes in annular lon` other shapedpassages formed i `near the periphery of each `brake drum, the saidvanes acting as `fanblades, and inducing t afdowof air inproxiinity tothe brake bearing surfaces duringtherotation of the said drum. i y t Asthe barrels of a multi-barrel winch ein-` bodying theinveiition areallsiini'lai it ln the accompanying drawings, Figure 1F l shows in centralvertical section a winch and barrel embodying the invention.

Fig, Q is an end view of the winch barrel pusieran.

, i 1 twnwri.`

l `Fig. 3 shows in plan a removable section of the brake riiii.` l i y`The barrel 0:` is freely mounted on the driving shaft -ZJ and is drivenin a hoisting of the sun wheel la The endo-fthe barrel remote from theepicyclie gear drums is formed-in one withV oi' is fixed to `anotherdrinn m that `is also"providedwith a band brake and that haspivcted toitpawls o adapted to" engage a ratchet wheel p fixed to the driving shaftbof the winch. llhe arrangement is such that," during hoisting, when thebarrel a and di'iving `shaft Z9 rotate in opposite directions, thepawlsofwill slip idly over the ratchet wheel p, but during lowering, when thebarrel d and` driving shaft Z9 rotate in the same direction, the

pawls o will engage the teeth of the ratchet wheel p. upon the rate ofrotation of the druin d overtaking that of` the driving shaft b, theengine, `which in the case of an electric winch may beashuntfwoundffinotor, then acting as a brake.' By' these ineaiis theworkusually taken by the ordinary brakes is or canrbe reduced withcorresponding prevenf tion of overheating. V

The brake bands r `are `all fittedwith wearing' blocks preferably `shod`with` coin- Apressedfiber and toprevent undue heating thebrake rime ofeach drum is inadeseparate from the drum proper and between it and thedrum is an annular space or pas sage i? iii which are vanes or blades athat extend in an inclined direction across the lwidth of the drinn.

rllhe separate rini s' is made in removable parts, as shown, so as to bereadily renewable without having to remove the drums proper and so thatthe brake bands r can be put in position without straining thein byhaving to expand them in order to clear flanges for which purpose thesaid bands are constructed in halves and afterward butted and joined atthe top. Each part of l l l :Patented duly n, ill-92d., 155mmammmmledymygg, 11917; seran no. 170,123. nivaiea ananas appiicancnaieanarcii l 35,1918. seriainaaaataf i by bolts theheads` of whichengage open ended'Tshapedslots in' the *drinn-a` and the nuts l of whicharev sunk in Arecesses formed therefor in the parts of vthe rim s.

tending aroundthe. drum Vto the operating device 3.A Toinsureuniforingripping and release of the band?1 fixed stops L areprovided at intervalsfabout ythe diameter of the drum as indicated indot andjdash lines in Fig. 2. These stops successively limit the outwardexpansion of the vband r as the brake-is released or moved into its offypo.- AsitionY and n consequently cause vsuch band `to quicklylandpractically simultaneously clear Y the drum throughout its diameterlAt the pointY where the band Vends are led away frornfthe dialin` to thepoint of anchorage and the operating mechanismV a Ystop or abut-VV ment5 is also providedior the saine purpose; Y 6, Fig. 2f, indicates aspring of which ythere may be'sev'eralthat 'tends to pull the band awayfrom the brake drum to facili'- tatequickrelease ofjgthebrake.

v 'i Annular-faces Tn-'Ton the adjacent Vfaces of the bijalredruinsd andg are adapted to be brought into frictional engagement by sliding :the,drum g towardthedrum d. When so enga-ged'with each other, the two drumswill revolvetogetherY if .the'brake bands of bothdrurns be-released, thedrum (l, which Y `normally rotates in a direction opposite to v d `thatof the shaftjb when the drum g isstationary, being then `driven inV- thereverse d-1reetion.-

Y 5 Int'heexample illustrated lthestol-)Svi.and

.l. Ina Winch, -a brake ldrurn formed with Tf-shapedV slots Vnear theperiphery thereof,

a brakerim built up of renewable sections VVon said'V drum, bolts theheads of which engage the vT-shaped slots of said brake 'drinn forfixing said rim sections on said Y Y .,drum, and vanes between theperiphery of Each brake band r comprises metal strips 4connectedtogether at e, as'regards the band n rshown 'in Figi?, one or moreof thestripsk extending Afrom the point vof j connection aroundthe 'drum tothepoint ofanchorage.- V2, and the other or others in like manner eX-said brake drum and said rim.

2. Ina winch, a brake druni formed wlth iT-shaped slots near theperiphery thereof, a brake rim of channel cross section built up ofrenewable sections on said drum, bolts the heads of which engage theT-shaped slots of said brake drum for fixing said riin sections on saiddrum, a brake band constructedin sections whereby it can be apslotsofsaid brake druin for fixing said rim sections on said drinn, a brakeband constructed in two sections whereby it can be applied to said brakeriin without straining said brake band and vanes between the peripheryof said brake drum and said rim.

4;. In a winch, a driven shaft, a barrel freely mounted on said shaft,epicyclic gear driven from said shaft and adapted to rotate said barrelin the opposite direction to that of said shaft, a brake drinncontrolling said 4epicyclic gear, a brake drum fixed to said barrel,each of Said brake drums. having ay brake riin made in parts from whichex tend inwardly ribs that rest on the peripheries of said brake-drumsand form air cooling passages, `a ratchet wheel fixed on said v shaft,'aratchet pawl on said barrel adapted to engage said ratchet wheel whensaid barrel rotates. relatively to the said shaft in the same directionyas that of the said shaft, a

bralreband on each of said drums, and fixed J stops forsaid brake bandarranged at regular intervals around said brake drums.

Statesconsulate general, this twenty-eighth day of February, 1918.'

GEORGE THOMAS MACFARLANE.

